2019 year born – age now in 2024?

How old am I in 2024 if I was born in 2019? Today's date is - 15 September 2024.

If year of birth - 2019, he is now:
4 years old or 5 years old*

*Depends on before or after 15 September 2019 year he was born.

If a person was born from January 1 2019 to 15 September 2019 inclusively, he is 5 years old now, otherwise, if after 15 September 2019 (until December 31 2019 inclusively), then he is still 4 years old now.

Other examples:

If 1926 year of birth - already 98 years or still 97 years.
If 1952 year of birth - already 72 years or still 71 years.
If 1995 year of birth - already 29 years or still 28 years.
If 2008 year of birth - already 16 years or still 15 years.

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